The area of genomics that is concerned with mapping and sequencing genomes is called __________
genomics.
a. comparative
b. structural
c. RFLP
d. EST
e. functional
B
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Blood levels of progesterone are highest in the _____ half of the cycle.
A. first B. second
Respond to the following statements with reference to the five components of respiratory systems listed below. Answers may be used more than once or not at all.
A. Air moves from the nasal cavity into this passageway. B. Another name for voice box. C. D. CO2 moves from the alveoli to this component during exhalation. E. This is the last component of the human lung that air flows into. F. Gas exchange between the air in the lungs and the blood circulatory system occurs here.
The repair of mismatched base pairs or damaged nucleotides in a DNA strand requires a multistep process. Which choice below describes the known sequence of events in this process?
(a) DNA damage is recognized, the newly synthesized strand is identified by an existing nick in the backbone, a segment of the new strand is removed by repair proteins, the gap is filled by DNA polymerase, and the strand is sealed by DNA ligase. (b) DNA repair polymerase simultaneously removes bases ahead of it and polymerizes the correct sequence behind it as it moves along the template. DNA ligase seals the nicks in the repaired strand. (c) DNA damage is recognized, the newly synthesized strand is identified by an existing nick in the backbone, a segment of the new strand is removed by an exonuclease, and the gap is repaired by DNA ligase. (d) A nick in the DNA is recognized, DNA repair proteins switch out the wrong base and insert the correct base, and DNA ligase seals the nick.
Which structure prevents blood flowing back into the atria during ventricular contractions?
A. foramen ovale B. semilunar valves C. atrioventricular valves D. carotid blood shunts E. sinoatrial node